First of all this problem is only with KDE. Im configuring my displays with nvidia-settings. I set to both right Hz and resolution But on second display allways there is some line that is separate moving objects, like when i move window arround the screen some line moving from buttom to top of the screen. Ths is very bad at movies :( Before few minutes i made a photo with my DSLR on high speed when moving an object on second display: http://postimage.org/image/bspv69jzr/
Please help :)